I've always been told to avoid K and N air filters for dirt use. I know they say that they filter better, and I have nothing to back up the non-use thoughts, but the concern was the high amount of very fine dirt, and it getting past the screen of a K and N..
I have no idea if it's a wives tale or not, but I just use UNI filters.. I know the inside of them is clean when I take them off to clean them after a lot of dirt use.
I have one on my 05 and have had no issues. I helped my brother do the 22 cent mod this past summer on his 08 and he tried to put a new K&N on it at the same time but it would not run. It would start and idle but any throttle imput would kill it. We thought we messed something up with the mixture screw or needle washers and slide drill out. Had us scratching our heads for a while untill we figured out that it was the filter. We even washed and re oiled it and it didnt make any difference. Put the stock filter back in and it ran great. Go figure?
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